Relativistic shocks in electron-positron plasmas, and polar CAP accretion onto neutron stars: Two non-linear problems in astrophysical plasma physics

Physics – Plasma Physics

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Electron-Positron Plasmas, Neutron Stars, Polar Caps, Relativistic Plasmas, Shock Waves, Accretion Disks, Astrophysics, Deposition, Plasma Physics

Scientific paper

Particle simulations and theory of relativistic shock waves in an e(+-) plasma are discussed. Magnetic reflection of particles is an essential role in the shock structure. Instability of the reflected particles in the shock front produces intense extraordinary mode radiation. Such shocks are candidates for the particle accelerator in plerions and in extragalactic jets only if the upstream Poynting flux comprises no more than 10 percent of the total. Analytical and numerical studies of radiation dominated accretion onto the magnetic poles of neutron stars are summarized. The upper limit to the photon luminosity depends on magnetic confinement, not on the dragging of photons into the star. Numerical solutions show the plasma forms large scale photon bubbles. It is suggested that the percolative loss of radiation controls the pressure and therefore the limits of magnetic confinement. Loss of magnetic confinement through resistive interchange instability is suggested as a means of generating TeV to PeV voltage drops along the magnetic field.

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